<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-alert
        title="填写商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <div style="text-align: left">
        <el-steps
          :space="200"
          :active="activeIndex - 0"
          finish-status="success"
          align-center
        >
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
      </div>
      <!-- 纵向标签页 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="tabPosition"
          :before-leave="beforeLeave"
          @tab-click="tabClick"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in tabManyData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="items"
                  v-for="(items, index) in item.attr_vals"
                  :key="index"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!-- 渲染静态属性 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in tabOnlyData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 上传图片 action 图片要上传到后台的api地址 -->
            <el-upload
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :file-list="fileList"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSucess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
            </el-upload>
            <!-- 预览图片对话框 -->
            <el-dialog :visible.sync="PreviewVisible" width="50%">
              <img :src="PreviewUrl" class="PreviewImg" />
            </el-dialog>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="addBtn" @click="Add"
              >确认添加</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
  </div>
</template>

<script>
// 倒入lodash 为深拷贝做准备  因为级联选择器绑定的元素是数组 但是提交的表单是字符串 直接转换会报错 所以使用lodash作为深拷贝来做中转
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      tabPosition: 'left',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        goods_cat: [], // 商品所属的新数组
        // 上传图片的临时路径
        pics: [],
        // 商品介绍
        goods_introduce: '',
        // 动静态属性的数组
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' }
        ]
      },
      // 获取所有的分类列表
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      tabManyData: [],
      // 静态属性列表
      tabOnlyData: [],
      // 上传图片的地址
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 上传的文件列表
      fileList: [],
      // 图片上传的请求头
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片路径
      PreviewUrl: '',
      // 预览图片对话框
      PreviewVisible: false
    }
  },
  created() {
    // 获取所有的分类
    this.getCateList()
  },
  methods: {
    // 提交表单
    Add() {
      // 提交商品前的预校验
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的信息')
        }
        // 执行网络请求进行添加
        // 把分类数组转换成带有逗号的字符串
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.tabManyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.tabOnlyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求  商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        // 添加完跳转到商品列表页面
        this.$router.push('/goods')
      })
    },
    // 获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类列表失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择器变化所触发的函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 标签页切换前的钩子
    beforeLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页名字' + activeName, '即将进入的标签页名字' + oldActiveName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('分类名称不能为空')
        return false
      }
    },
    // tab 被选中的时候触发
    tabClick() {
      // console.log('当前激活的面板' + this.activeIndex)
      // 请求动态参数
      if (this.activeIndex === '1') {
        this.getManyList()
      }
      // 请求静态属性
      if (this.activeIndex === '2') {
        this.getOnlyList()
      }
    },
    // 请求商品动态参数
    async getManyList() {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取动态参数失败')
      }
      // 把带空格的属性进行分割
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
      })
      this.tabManyData = res.data
      // console.log(this.tabManyData)
    },
    // 请求商品静态属性
    async getOnlyList() {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取动态参数失败')
      }
      this.tabOnlyData = res.data
      // console.log(this.tabOnlyData)
    },
    // 预览图片
    handlePreview(file) {
      console.log(file)
      this.PreviewUrl = file.response.data.url
      this.PreviewVisible = true
    },
    // 图片移除
    handleRemove(file, fileList) {
      console.log('点击了图片移除按钮')
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从pics数组中，找到这个图片对应的索引值
      const index = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的splice方法 把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(index, 1)
      console.log(this.addForm.pics)
    },
    // 图片上传成功地回调
    handleSucess(response, file, fileList) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    }
  },
  // 计算属性 简化操作
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.addBtn {
  margin-top: 15px;
}
.PreviewImg {
  width: 100%;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.el-form {
  text-align: left;
}
.el-steps {
  margin: 15px 0px;
}
.el-step__title {
  font-size: 10px;
}
</style>
